The "marketplace of ideas" was always a flawed metaphor. Ideas don't compete on merit; they compete on memetic fitness—how easily they spread, how good they make believers feel, and how effectively they suppress competing ideas.
@Daojoan For what it is worth, the marketplace doesn't compete on merit either. There are legions of products that lost out to empirically inferior products.
@gpilz @Daojoan Just like #VHS won even though #Betamax and #Video2000 were both better.